I am also in the process of learning how to do in-cylinder simulations in FLUENT. All I can suggest is to read Ch 9 in help files on deforming meshes and setting up cylindar problems and then do tut 11 on moving meshes. Then try to set up a 2D simple cylindar with valves. I am at this stage and struggling. The help files are sketchy and I have contacted the FLUENT agent for advice. He is looking for a engine tutorial for me. I'll send it to you if he finds one. Gareth